NEW ORLEANS – Actor Brad Pitt’s foundation has sued a New Orleans architect, saying defective design work led to leaks and other flaws in homes built for residents of an area that was among the hardest hit by Hurricane Katrina.

The lawsuit filed Tuesday says damages caused by architect John C. Williams could cost Pitt’s Make It Right foundation more than $15 million, news outlets reported. The foundation paid Williams’ firm millions of dollars to produce architectural drawings for more than 100 homes under the program, which was supposed to provide Lower 9th Ward residents with sustainable and affordable new homes.

Enlisting award-winning architects, Pitt founded the venture two years after Katrina devastated the city and essentially washed away what would become the Make It Right enclave. Construction began in 2008, working toward replacing the lost housing with 150 avant-garde dwellings that were storm-safe, solar-powered, highly insulated and “green.” But water intrusion began cropping up in the first homes within a year of their completion and construction was discontinued in 2016.

The foundation says Williams was responsible for several failures to adequately waterproof the structures, including insufficiently sloped roofs. The lawsuit says Williams’ attempts at repairs were largely a failure and that he kept Make It Right management in the dark about the defects.

A derelict 7-year-old home that was so rotted it was demolished at the insistence of neighbors in June. Williams had been granted a permit to replace the flat roof on the leaking home in 2015. He had acknowledged in a June interview that one or two of the Make It Right buildings “may be falling apart.” Williams didn’t immediately return a request for comment, news outlets reported Wednesday.

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In this combination of images, evacuees sit in an area next to the Superdome (top) in New Orleans in the aftermath of Hurricane Katrina in this Sept. 2, 2005 photo and the same area again photographed Aug. 17, 2015 at the ten year anniversary of the devastating storm. Ten years ago, Hurricane Katrina swept buildings off their foundations and deluged nearly all of New Orleans with floodwaters which rose so fast some people drowned in their homes. Those who made it to their rooftops or the relative safety of dry land waited days to be rescued as the Big Easy descended into chaos. Today, colorful homes on stilts have replaced many of the rotting hulks left behind after the low-lying coastal city in the southern United States was finally drained. AFP/Getty Images

Canal Street in the French Quarter of New Orleans is pictured, nearly one year after Hurricane Katrina. In this bottom photo taken on Aug. 29, 2005, debris is scattered across Canal street in the French Quarter of New Orleans as Hurricane Katrina makes landfall. Robyn Beck, AFP/Getty Images

A road in the Ninth Ward of New Orleans nearly one year after Hurricane Katrina flooded this area of the city. Then in this photo taken on Sept.23, 2005, (bottom) water floods back into streets of the Ninth Ward after surge waters from Hurricane Rita topped over a patched section of the levee along the Industrial Canal, which had given way during Hurricane Katrina in New Orleans. Robyn Beck, AFP/Getty Images

A service cart drives past the Louisiana Superdome (top) nearly one year after Hurricane Katrina devastated the city, July 10, 2006. In the bottom photo photo taken on Sept. 2, 2005, Hurricane Katrina survivors wait outside the Superdome and Convention Center in New Orleans. Robyn Beck, AFP/Getty Images

This street in the French Quarter of New Orleans was photographed July 11, 2006. The same street photographed Aug. 29, 2005, has automobiles sitting damaged from falling debris after Hurricane Katrina made landfall near the southern port city. Robyn Beck, AFP/Getty Images

People wait for their luggage at the baggage carousel upon arrival in New Orleans, at Louis Armstrong International Airport, Aug. 11, 2006. Then on Sept. 3, 2005, (bottom) hundreds of people on stretchers wait to be evacuated at the same airport. Robyn Beck, AFP/Getty Images

The New Orleans Central Business District (left) almost one year after Hurricane Katrina flooded this area of the city, July 9, 2006. Then on Sept 6, 2005, a helicopter flies overhead in New Orleans, LA, eight days after Hurricane Katrina devastated the region. AFP/Getty Images

Homes and vacant lots (bottom) stand in the Lower Ninth Ward in front of the Industrial Canal and downtown New Orleans Aug. 24, 2015 in New Orleans. The same devastated Lower Ninth Ward is seen in front of the Industrial Canal with the city skyline in the background Aug. 25, 2006. Mario Tama, Getty Images

A school bus drops off a student in front of the Claiborne Bridge in the Lower Ninth Ward May 12, 2015 in New Orleans. The same neighborhood was devastated by flooding from Hurricane Katrina. (bottom) Mario Tama, Getty Images

New homes (top) tsand along the rebuilt Industrial Canal levee in the Lower Ninth Ward, May 16, 2015 in New Orleans. Workers rebuild the same levee which was breached by Hurricane Katrina along the Industrial Canal in the Lower Ninth Ward April 25, 2006 Mario Tama, Getty Images

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The lawsuit comes after New Orleans attorney Ron Austin brought a class-action lawsuit against Make It Right that accused the charity of building substandard homes that are deteriorating at a rapid pace. On Tuesday, Make It Right blamed the rapid deterioration on the architect they hired.

The lawsuit against Williams does not hold him liable for the damages to 39 homes caused by the use of an experimental weatherproof wood product called TimberSIL that was rapidly ruined by the south Louisiana environment. In 2014, Make It Right sued the manufacturer of TimberSIL for $500,000, though it’s unclear if the company was made to pay.

In a prepared statement, Make It Right pledged to “continue to work proactively with homeowners in the Lower 9th Ward.” The non-profit organization declined further comment.